Productivity index index per unit of working reservoir thickness:
j = \frac{J}{h} =\frac{q/h}{|p_e - p_{wf}|} |
where
| Productivity Index | |
| Flowrate (the specification of which may differ, see below) | |
| Effective reservoir thickness | |
| Formation pressure | |
| Bottom hole pressure at sandface |
The definition of flowrate and formation pressure
may vary depending on application of productivity index.